Home Tech Bees Are Dying Off. Tiny QR Code Backpacks May Help Save ThemTechBees Are Dying Off. Tiny QR Code Backpacks May Help Save ThemNovember 8, 2018175FacebookTwitterPinterestWhatsApp A novel system monitors the dynamics of colonies exposed to imidacloprid, a neurotoxin that belongs to the infamous neonicotinoid group of pesticides.